The mouse works fine, no problem with the Bluetooth. It is automatically recognized by win 8.1. By cons, a problem I did not expect at all, this mouse slides very badly on my carpet "steelseries" fabric: ; Ie = UTF8 & qid = 1423924707 & sr = 1-1 & keywords = steelseries It hangs too! I do not think the shoes of this mouse are teflon ... as is usually the case, but rather simple PLASTIC! Too bad. If you do not have a cloth mouse pad, this problem may be less obvious.